So I created this build when I was bored of using spirit generators on Nightmare, and so far it seems to have boosted my damage. The only things to keep in mind are that you ALWAYS keep your mantra on, and NEVER spam abilities. Here are the explanations for each ability:

Lashing Tail:

Mantra of Healing:

By far the most important skill of this class. This spell will be the main source of your spirit generation, so ALWAYS have this on. The healing is an added bonus.

Breath of Heaven:

Heals you up and deals some damage, all for a low spirit cost. Really you can choose any heal spell for this slot, but I like this one because it heals you and does some damage.

Blinding Flash:

Again, you'll find yourself using this a lot. VERY low spirit to use, sometimes causes enemies to attack each other, lessening how much spirit you have to spend.

Exploding Palm:

Don't use this often. Despite the high(er) spirit cost, this can generate MASSIVE amounts of spirit when used on a horde or group.

Dashing Strike:

This spell is another one of those "deal some damage, gtfo monsters, not much spirit" spells, like blinding flash. Really you can use any spell you want, but low spirit is best. Even so, if you can keep your spirit up with Wave of Light or 7 Sided, congrats to you and have fun with them!

Also, Air Ally is good because it contributes to your Spirit pool.

Transcendence:

Must-have for all Monks. Heals you with every spell.

Chant of Resonance:

Makes your Healing Mantra give you extra spirit, which is essential.

Exalted Soul:

Makes sure you have a large pool of Spirit to draw from.

Anyway, this build is a lot of fun and can do a lot of damage if mastered, and is also a welcome difference (to me) from the monotonous "spam the spirit generators then spam everything else!" kinda feel to the monk.